But for home maintenance and peace of mind, it's good to know how to identify common backyard bird eggs and the one you don't want to see — the house sparrow, which is a pest, believe it or not.

Scientists have used imafe recognition technology to show that birds defending their nests against the Common Cuckoo ... a given host will identify and reject a foreign egg.

Each strategy is effective, increasing the likelihood that a given host will identify ... patterns on bird eggs are just one type of visual signature. Identity signatures are common in the animal ...

The Great Backyard Bird Count is an annual citizen-science project that gathers data about wild birds. Participants go outside for at least 15 minutes and identify as many birds as they can.